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determinati nr. nat x stiind ca x*(x+1)+(x+1)*(x+2)=98

Răspuns :


x*(x+1)+(x+1)*(x+2)=98
(x+1)(x+x+2)=98
(x+1)(2x+2)=98
(x+1)(x+1)=49
x+1=7
x=6